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Subtract 20/21 from 15/56

15/56 - 20/21 is -115/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 21 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 56 × 3 = 168,
    15/56 = 15 × 3/56 × 3 = 45/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    20/21 = 20 × 8/21 × 8 = 160/168
  4. Subtract the two like fractions:
    45/168 - 160/168 = 45 - 160/168 = -115/168

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